CN118158755B - Wireless network roaming switching method - Google Patents
Wireless network roaming switching method Download PDFInfo
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- CN118158755B CN118158755B CN202410565228.9A CN202410565228A CN118158755B CN 118158755 B CN118158755 B CN 118158755B CN 202410565228 A CN202410565228 A CN 202410565228A CN 118158755 B CN118158755 B CN 118158755B
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- 208000033748 Device issues Diseases 0.000 claims description 3
- 230000000737 periodic effect Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 description 12
- 238000005516 engineering process Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000003860 storage Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 4
- 230000000875 corresponding effect Effects 0.000 description 3
- 238000004590 computer program Methods 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/0085—Hand-off measurements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/14—Reselecting a network or an air interface
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
- H04W36/302—Reselection being triggered by specific parameters by measured or perceived connection quality data due to low signal strength
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
- H04W36/322—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data by location data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/02—Access restriction performed under specific conditions
- H04W48/04—Access restriction performed under specific conditions based on user or terminal location or mobility data, e.g. moving direction, speed
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/18—Selecting a network or a communication service
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W8/00—Network data management
- H04W8/26—Network addressing or numbering for mobility support
- H04W8/28—Number portability ; Network address portability
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Computer Security & Cryptography (AREA)
- Databases & Information Systems (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention discloses a wireless network roaming switching method. When the field device joins the WIA-FA network for the first time, scanning is carried out on a preset access device working channel, the access device with the maximum access signal strength is selected for connection, and the information of all scanned access devices is reported to the gateway device; after the field device is connected to the WIA-FA network, setting a scanning period of the access device according to the signal intensity of the access device connected with the field device; the field device reports the information such as the signal intensity, the channel and the device AD of the scanned access device to the gateway device; when the access equipment connected with the field equipment is abnormally off-line, the field equipment selects other optional access equipment scanned in the last scanning period to be connected, and the information of the selected access equipment and the information of the abnormally off-line access equipment are simultaneously reported to the gateway equipment, so that the time delay influence on the equipment sending data due to roaming switching of the field equipment among a plurality of access points can be solved.
Description
Technical Field
The present invention relates to the field of network communication technologies, and in particular, to a wireless network roaming switching method.
Background
Along with the development of intelligent manufacturing in China, the high-real-time and high-reliability industrial wireless WIA-FA technology has been developed and applied in various important industries in China, and the MAC layer of the WIA-FA network technology is an access mechanism based on TDMA, so that deterministic communication period and time delay can be ensured, and the method is suitable for industrial control application.
The MAC layer of WIA-FA network technology is an access mechanism based on TDMA, can ensure deterministic communication period and time delay, and is suitable for industrial control application. In a TDMA network of a WIA-FA, the time delay of the WIA-FA equipment for transmitting data is calculated by a TDMA scheduling strategy. In a WIA-FA network, where multiple access devices are present, frequent movement of the field device will trigger a roaming handoff of the field device between the multiple access devices. The roaming policy of the field device has a particularly significant impact on the latency of sending data by the WIA-FA device. Roaming switching of field devices among multiple access points can have a delay impact on the device's transmitted data. To solve this problem, a wireless network roaming handover method is developed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a wireless network roaming switching method to solve the problem that the roaming switching of field equipment among a plurality of access points can cause time delay influence on the data transmission of the equipment.
The invention provides a wireless network roaming switching method, which comprises the following steps:
when the field device joins the WIA-FA network for the first time, scanning is carried out on a preset access device working channel, the access device with the maximum access signal strength is selected for connection, and the information of all the scanned access devices is reported to the gateway device;
after the field device is accessed to the WIA-FA network, setting a scanning period of the field device to the access device according to the signal intensity of the access device connected with the field device;
the field device reports the scanned information and signal strength of the access device to the gateway device;
Under the condition that the access equipment connected with the field equipment is abnormally offline, the field equipment selects other optional access equipment scanned in the previous scanning period to be connected, and after the selection, the information of the selected access equipment and the information of the abnormally offline access equipment are simultaneously reported to the gateway equipment.
Further, the method further comprises:
Setting the spatial coordinate position of one access device scanned by the field device as coordinates (0, 0), and calculating the spatial coordinate position of other access devices scanned by the field device according to the distance between the access device and other access devices scanned by the field device;
Storing the spatial coordinate position of the access device scanned by the field device in the gateway device as a spatial coordinate position information table, and maintaining and updating; and if one of the access devices stops working, updating the space coordinate position information table of the access device.
Further, the method further comprises:
The method comprises the steps that the field device receives indication information of a switching access point of gateway equipment, wherein the indication information comprises a switching channel, access point information and a switching time point of a time slot of the gateway equipment;
And the field device switches the connected access device according to the indication information.
Further, the method further comprises:
The gateway equipment calculates the moving direction and the position of the field equipment based on the signal intensity of the access equipment fed back by the moving field equipment through periodic scanning;
the gateway equipment calculates the next roaming switching access equipment of the field equipment in advance based on the signal strength threshold value between the field equipment and the current access equipment and according to the reporting frequency of the field equipment;
The gateway device informs the field device of the access device of the next roaming switch in advance by issuing an instruction.
Further, the method further comprises:
The gateway equipment calculates the moving direction of the field equipment, the next optimal access equipment, the suboptimal access equipment and the optimal switching time point in advance through rsi according to the information of more than three access equipment by combining the signal intensity of the access equipment reported by the field equipment based on the stored space coordinate position of the access equipment;
The gateway device issues the moving direction of the field device, the next optimal access device, the suboptimal access device and the optimal switching time point to the access device.
Further, the method further comprises:
After the gateway equipment transmits the switching information, the field equipment reaches the optimal switching time point, after the field equipment switches the access equipment, the signal intensity of the access equipment is reported to the gateway equipment immediately if the signal intensity of the access equipment is larger than a certain value relative to the signal intensity of the previous access equipment;
and the gateway equipment judges whether the current field equipment moves in the intersection of the coverage areas of the two access equipment according to the reported information, and if so, the gateway equipment adjusts the switching roaming threshold value of the current field equipment.
Further, the method further comprises:
the field device caches gateway device indication switching access point information;
The gateway equipment caches the scanning access point information of the field equipment in the current WIA-FA network according to the configuration setting, and converts the signal intensity of the access equipment obtained by the field equipment into a distance according to the relation between the distance and the signal intensity in the scanning access point information;
The gateway device calculates the best possible switching time and access point information for the current field device based on the saved coordinate location of the access device and the field device reporting time interval.
The beneficial effects of the invention are as follows: the wireless network roaming switching method designs a roaming switching scheme based on the WIA-FA network in the moving process of the field device, and can effectively solve the problem of delay influence on data transmission of the device due to roaming switching of the field device among a plurality of access points.
Drawings
Fig. 1 is a flowchart of a wireless network roaming handover method according to the present invention.
Detailed Description
The following non-limiting examples will provide those skilled in the art with a more complete understanding of the invention, but are not intended to limit the invention in any way, and it is to be noted that the following examples are not to be construed as limiting the scope of the invention, as many insubstantial modifications and adaptations of the invention as would be within the scope of the invention in light of the foregoing disclosure by those skilled in the art.
Referring to fig. 1, the present invention provides a wireless network roaming handover method, which includes:
S101, when the field device joins the WIA-FA network for the first time, scanning is carried out on a preset access device working channel, the access device with the largest access signal strength is selected for connection, and information of all scanned access devices is reported to the gateway device.
The WIA-FA network is a wireless network technology with wide application prospect in the industrial field, and provides an efficient and reliable wireless data transmission solution for factory automation through self-adaptive frequency selection and network performance optimization. The solution designs the device A, B, C, D, E to support WIA-FA functionality and gateway devices. The A devices are used as field devices, B, C, D, and the E devices are used as access devices, and together form a WIA-FA communication network.
S102, after the field device is connected to the WIA-FA network, setting a scanning period of the field device to the access device according to the signal intensity of the access device connected to the field device.
For example, the signal strength rsi > = -50dbm, the scan interval is 5s; -65 dbm= < rsi < -50dbm with a scan interval of 3s; rssi < -65dbm, scan interval of 1s. The specific rssi threshold and scan interval are configured with the actual environment.
Setting the scan period of the field device to the access device according to the signal strength of the access device to which the field device is connected can ensure that the device maintains efficient communication with sufficient signal strength while increasing the scan frequency to maintain connection stability when the signal is weak. The specific process is as follows:
and (5) detecting signal intensity. The field device should be able to periodically detect the signal strength with the access device.
The scanning period range is set. And setting a reasonable scanning period range according to application requirements. For example, the scan period may be longer when the signal is strong and the scan period should be shorter when the signal is weak. The minimum and maximum values of the scan period are determined to ensure that the device does not scan too frequently or not scan for long periods of time.
Scanning period adjustment based on signal strength. According to the detected signal intensity, the field device can dynamically adjust the scanning period of the field device to the access device; for example, a signal strength threshold may be set. When the signal strength is above this threshold, the device may increase the scan period; when the signal strength is below this threshold, the device should decrease the scan period.
And (5) smooth adjustment. To avoid frequent adjustments due to minor fluctuations in signal strength, a smoothing mechanism may be introduced. For example, the adjustment of the scan period is only performed when the signal strength is above or below a threshold value for a period of time. The use of a weighted average or a sliding window average may also be considered to process the signal strength data to reduce the effects of noise and transient fluctuations.
S103, the field device reports the scanned information and signal strength of the access device to the gateway device.
Specifically, the field device appends the scanned information and signal strength of the access device to the reporting data or reports the information and signal strength of the access device to the gateway device in unicast frames.
S104, under the condition that the access equipment connected with the field equipment is abnormally offline, the field equipment selects other optional access equipment scanned in the previous scanning period to be connected, and after the selection, the information of the selected access equipment and the information of the access equipment which is abnormally offline are simultaneously reported to the gateway equipment.
As an alternative embodiment, the method further comprises:
Setting the spatial coordinate position of one access device scanned by the field device as coordinates (0, 0), and calculating the spatial coordinate position of other access devices scanned by the field device according to the distance between the access device and other access devices scanned by the field device;
Storing the spatial coordinate position of the access device scanned by the field device in the gateway device as a spatial coordinate position information table, and maintaining and updating; and if one of the access devices stops working, updating the space coordinate position information table of the access device.
The present solution contemplates gateway devices managing address allocation within the WIA-FA network. The access device performs other verification on the accessed field device except the function specified in the WIA-FA standard, and the MAC layer and the physical layer only bear forwarding the data from the gateway to the field device; the data of the field device is forwarded to the gateway device.
As an alternative embodiment, the method further comprises:
The method comprises the steps that the field device receives indication information of a switching access point of gateway equipment, wherein the indication information comprises a switching channel, access point information and a switching time point of a time slot of the gateway equipment; and the field device switches the connected access device according to the indication information.
When the field device receives the indication information of the switching access point sent by the gateway device, the device executes corresponding operation according to the information, so as to ensure that the device can smoothly switch to a new access point and keep the continuity of communication, obviously improve the reliability of communication, optimize the utilization of network resources, reduce energy consumption, enhance the flexibility and the expandability of the network and simplify the network management. The specific process is as follows:
And receiving indication information. The field device needs to be able to receive and correctly parse the indication of the handover access point sent by the gateway device. The indication information should contain the switching channel, new access point information and the switching time point of the gateway device time slot.
And analyzing and verifying the indication information. The field device parses the indication information to extract the switching channel, the new access point address or identifier, and the switching time point. The device should verify the validity of this information, e.g. check if the access point information is legitimate, if the channel is within the available range, etc.
And (5) adjusting the configuration. Based on the indication, the field device needs to adjust its wireless communication configuration. This includes switching to a new channel and configuring parameters associated with the new access point, such as address, port, etc.
Waiting for a handoff time point. The field device waits until the switch point in time specified in the indication. During this time, the device may continue to communicate with the current access point while being ready to handoff to a new access point.
A switching operation is performed. When the switching point in time is reached, the field device disconnects from the current access point. The device will then attempt to establish a connection with the new access point using the previously configured new channel and access point information.
And verifying the connection state. After the handoff is completed, the field device needs to verify the connection status with the new access point. If the connection is successful, the device can continue normal communication; if the connection fails, the device may need to retry the connection or fall back to the previous access point.
The gateway device is notified. The field device may inform the gateway device of the result of the switching operation so that the gateway device can understand the network status and perform corresponding management.
During the whole process, some possible abnormal situations, such as error indication information, unavailability of a new access point, handover failure, etc., need to be considered. The field device should be able to handle these anomalies and take corresponding actions, such as retries, rollbacks, or reporting errors. In addition, in order to ensure smooth switching, a good communication protocol and a synchronization mechanism should be used between the gateway device and the field device to ensure accurate transmission of the indication information and coordination of switching operation.
As an alternative embodiment, the method further comprises: the gateway equipment calculates the moving direction and the position of the field equipment based on the signal intensity of the access equipment fed back by the moving field equipment through periodic scanning; the gateway equipment calculates the next roaming switching access equipment of the field equipment in advance based on the signal strength threshold value between the field equipment and the current access equipment and according to the reporting frequency of the field equipment; the gateway device informs the field device of the access device of the next roaming switch in advance by issuing an instruction.
The gateway device can calculate the moving direction and the position of the field device and pre-judge and prepare the access device of the next roaming switching in advance by utilizing the signal intensity of the access device which is periodically scanned and fed back by the moving field device. The intelligent management mode can remarkably improve the communication efficiency and stability between the field device and the access point. The gateway equipment calculates and plans the management mode of the roaming switching access point in advance based on the signal intensity feedback of the mobile field equipment, has a plurality of advantages, and can remarkably improve the communication efficiency, the stability and the network resource utilization rate.
As an alternative embodiment, the method further comprises: the gateway equipment calculates the moving direction of the field equipment, the next optimal access equipment, the suboptimal access equipment and the optimal switching time point in advance through rsi according to the information of more than three access equipment by combining the signal intensity of the access equipment reported by the field equipment based on the stored space coordinate position of the access equipment; the gateway device issues the moving direction of the field device, the next optimal access device, the suboptimal access device and the optimal switching time point to the access device.
As an alternative embodiment, the method further comprises: after the gateway equipment transmits the switching information, the field equipment reaches the optimal switching time point, after the field equipment switches the access equipment, the signal intensity of the access equipment is reported to the gateway equipment immediately if the signal intensity of the access equipment is larger than a certain value relative to the signal intensity of the previous access equipment; and the gateway equipment judges whether the current field equipment moves in the intersection of the coverage areas of the two access equipment according to the reported information, and if so, the gateway equipment adjusts the switching roaming threshold value of the current field equipment.
As an alternative embodiment, the method further comprises: the field device caches gateway device indication switching access point information; the gateway equipment caches the scanning access point information of the field equipment in the current WIA-FA network according to the configuration setting, and converts the signal intensity of the access equipment obtained by the field equipment into a distance according to the relation between the distance and the signal intensity in the scanning access point information; the gateway device calculates the best possible switching time and access point information for the current field device based on the saved coordinate location of the access device and the field device reporting time interval.
The embodiment of the invention also provides a storage medium, and the embodiment of the invention also provides a storage medium, wherein the storage medium stores a computer program, and the computer program realizes part or all of the steps in each embodiment of the wireless network roaming switching method provided by the invention when being executed by a processor. The storage medium may be a magnetic disk, an optical disk, a Read-only memory (ROM), a Random Access Memory (RAM), or the like.
It will be apparent to those skilled in the art that the techniques of embodiments of the present invention may be implemented in software plus a necessary general purpose hardware platform. Based on such understanding, the technical solutions in the embodiments of the present invention may be embodied in essence or what contributes to the prior art in the form of a software product, which may be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the embodiments or some parts of the embodiments of the present invention.
The same or similar parts between the various embodiments in this specification are referred to each other. The embodiments of the present invention described above do not limit the scope of the present invention.
Claims (6)
1. A wireless network roaming handoff method, comprising:
when the field device joins the WIA-FA network for the first time, scanning is carried out on a preset access device working channel, the access device with the maximum access signal strength is selected for connection, and the information of all the scanned access devices is reported to the gateway device;
after the field device is accessed to the WIA-FA network, setting a scanning period of the field device to the access device according to the signal intensity of the access device connected with the field device;
the field device reports the scanned information and signal strength of the access device to the gateway device;
Under the condition that the access equipment connected with the field equipment is abnormally offline, the field equipment selects other optional access equipment scanned in the previous scanning period to be connected, and after the selection, the information of the selected access equipment and the information of the abnormally offline access equipment are simultaneously reported to the gateway equipment;
Setting the spatial coordinate position of one access device scanned by the field device as coordinates (0, 0), and calculating the spatial coordinate position of other access devices scanned by the field device according to the distance between the access device and other access devices scanned by the field device;
Storing the spatial coordinate position of the access device scanned by the field device in the gateway device as a spatial coordinate position information table, and maintaining and updating; and if one of the access devices stops working, updating the space coordinate position information table of the access device.
2. The wireless network roaming handoff method of claim 1, wherein said method further comprises:
The method comprises the steps that the field device receives indication information of a switching access point of gateway equipment, wherein the indication information comprises a switching channel, access point information and a switching time point of a time slot of the gateway equipment;
And the field device switches the connected access device according to the indication information.
3. The wireless network roaming handoff method of claim 1, wherein said method further comprises:
The gateway equipment calculates the moving direction and the position of the field equipment based on the signal intensity of the access equipment fed back by the moving field equipment through periodic scanning;
the gateway equipment calculates the next roaming switching access equipment of the field equipment in advance based on the signal strength threshold value between the field equipment and the current access equipment and according to the reporting frequency of the field equipment;
The gateway device informs the field device of the access device of the next roaming switch in advance by issuing an instruction.
4. The wireless network roaming handoff method of claim 1, wherein said method further comprises:
The gateway equipment calculates the moving direction of the field equipment, the next optimal access equipment, the suboptimal access equipment and the optimal switching time point in advance through rsi according to the information of more than three access equipment by combining the signal intensity of the access equipment reported by the field equipment based on the stored space coordinate position of the access equipment;
The gateway device issues the moving direction of the field device, the next optimal access device, the suboptimal access device and the optimal switching time point to the access device.
5. The wireless network roaming handoff method of claim 1, wherein said method further comprises:
After the gateway equipment transmits the switching information, the field equipment reaches the optimal switching time point, after the field equipment switches the access equipment, the signal intensity of the access equipment is reported to the gateway equipment immediately if the signal intensity of the access equipment is larger than a certain value relative to the signal intensity of the previous access equipment;
and the gateway equipment judges whether the current field equipment moves in the intersection of the coverage areas of the two access equipment according to the reported information, and if so, the gateway equipment adjusts the switching roaming threshold value of the current field equipment.
6. The wireless network roaming handoff method of claim 1, wherein said method further comprises:
the field device caches gateway device indication switching access point information;
The gateway equipment caches the scanning access point information of the field equipment in the current WIA-FA network according to the configuration setting, and converts the signal intensity of the access equipment obtained by the field equipment into a distance according to the relation between the distance and the signal intensity in the scanning access point information;
The gateway device calculates the best possible switching time and access point information for the current field device based on the saved coordinate location of the access device and the field device reporting time interval.
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| CN114520993A (en) * | 2022-03-08 | 2022-05-20 | 沈阳中科奥维科技股份有限公司 | Wireless transmission system network self-optimization method based on channel quality monitoring |
| CN116367251A (en) * | 2023-03-31 | 2023-06-30 | 珠海泰芯半导体有限公司 | Roaming method, device and system of WiFi equipment, storage medium and WiFi equipment |
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| CN116723455A (en) * | 2023-04-28 | 2023-09-08 | 沈阳邦粹科技有限公司 | Equipment and method based on WIA-FA network positioning |
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| CN114520993A (en) * | 2022-03-08 | 2022-05-20 | 沈阳中科奥维科技股份有限公司 | Wireless transmission system network self-optimization method based on channel quality monitoring |
| CN116367251A (en) * | 2023-03-31 | 2023-06-30 | 珠海泰芯半导体有限公司 | Roaming method, device and system of WiFi equipment, storage medium and WiFi equipment |
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